To realize practical KIBs, it is of primary importance to develop novel positive electrodes. In this study, we develop new cathode materials with layered-structure (i. e. KxTMO2, TM = Co and Mn)5, 6 for KIBs and investigate K-storage properties and underlying K-storage mechanism in them by in-situ diffraction and electrochemical characterization combined with theoretical first-principles calculations.
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